hi people i constructed a 741 op amp oscillator. it is giving an output bt its a triangular wave.... but i want a pure sine wave... how do i get a sine wave... the freq is around 40KHz.... i used a wein bridge config... like the one shown in the figure..... either tell me how to get a sine from the osc or tell me how to shape a triangular to a sine wave.....

hi people i constructed a 741 op amp oscillator. it is giving an output bt its a triangular wave.... but i want a pure sine wave... how do i get a sine wave... the freq is around 40KHz.... i used a wein bridge config... like the one shown in the figure..... either tell me how to get a sine from the osc or tell me how to shape a triangular to a sine wave.....

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If you do it right, that is a Wien Bridge oscillator. It generates sine waves. Google "Wien Bridge" for lots of information.

The lousy old 741 opamp (it is 40 years old this year) is so slow that it turns all signals above only 9khz into a triangle-wave. A TL071 audio opamp and many other opamps work up to 100kHz. An OP134 audio opamp work up to 250kHz.

The lousy old 741 opamp (it is 40 years old this year) is so slow that it turns all signals above only 9khz into a triangle-wave. A TL071 audio opamp and many other opamps work up to 100kHz. An OP134 audio opamp work up to 250kHz.

When you were learning to drive, did you start off in a Lamborghini Countach?

Probably not...

I started off driving in a '63 Fiat 1100D (looked like a scaled-down Checker cab, engine was a 1088CC 4-cylinder) that had tires thin as baloney skins in the rear. It was so underpowered, you'd have to drive it off a cliff with a tailwind to get it up to 70mph.

When you were learning to drive, did you start off in a Lamborghini Countach?

Probably not...

I started off driving in a '63 Fiat 1100D (looked like a scaled-down Checker cab, engine was a 1088CC 4-cylinder) that had tires thin as baloney skins in the rear. It was so underpowered, you'd have to drive it off a cliff with a tailwind to get it up to 70mph.

It sure made me appreciate my '65 Mustang GT convertible a lot more.

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Hey! I had a brand new '66 Mustang GT fastback, yellow with black interior. I loved that car, but sold it when married and the kids started popping out.

PS: I found an interesting backdoor circuit in that car. Without a key in the ignition if you turned on the safety blinker, put foot on brake the radio would pulsate on and off with the blinker timing
Lefty

When you were learning to drive, did you start off in a Lamborghini Countach?

Probably not...

I started off driving in a '63 Fiat 1100D (looked like a scaled-down Checker cab, engine was a 1088CC 4-cylinder) that had tires thin as baloney skins in the rear. It was so underpowered, you'd have to drive it off a cliff with a tailwind to get it up to 70mph.

It sure made me appreciate my '65 Mustang GT convertible a lot more.

Click to expand...

So what's the lesson here? Start out with a crappy op amp, so you will appreciate the better ones when you can afford them?

PS: I found an interesting backdoor circuit in that car. Without a key in the ignition if you turned on the safety blinker, put foot on brake the radio would pulsate on and off with the blinker timing
Lefty